Clinical, biological, electrophysiological and therapeutic profile of patients with anti-MAG neuropathy according to MYD88 and CXCR4 mutations and underlying haemopathy.

Introduction: Anti-MAG neuropathies are associated with an IgM monoclonal gammopathy of undetermined significance (MGUS) or with a malignant haemopathy. Our objective was to determine whether the presence of a haemopathy or somatic mutations of MYD88 and CXCR4 genes influences disease presentation and response to rituximab (RTX).

Methods: We included 79 patients (mean age 74 years, disease duration 9.